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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53d02012896dccc3ca979ae9ac0a1f0b5eb000fed47ff8c2c0336fadb1fa8ec' 
  AND token = 'u/G9N810J9DZLfWcEniMUd/WOVlxhVDkJ+Jef9CdIPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}